干旱区地理2024，Vol.47Issue(2)：214-227,14.DOI:10.12118/j.issn.1000-6060.2023.070
祁连山地区过去500 a年代际旱涝事件演化及驱动因素分析
Evolution and driving factors of megadrought and pluvial events in the Qilian Mountains during the past 500 years
摘要
Abstract
Qilian Mountains is a climate-sensitive area in the arid areas of northwest China,where extreme mega-drought events considerably impact vegetation,frozen soil,and other ecological elements.This paper uses three hydroclimate reconstruction datasets to analyze the occurrence,evolution,and possible driving mechanism of megadrought and pluvial events in the Qilian Mountains over the past 500 years.The results showed that the cli-mate in the Qilian Mountains has shown a clear wetting trend since the recent decades,and the wetness trend af-ter 1951 has exceeded the range of natural variability in the historical period.The RAP dataset provided a good representation of the historical dry and wet conditions in the study area.Significant variations were observed in precipitation during the past seven megadrought events in the region,with the highest severity occurring during the drought period of 1786-1796.Furthermore,considerable variations were noted in the duration of the four megapluvial events,with the longest duration being a wet event that lasted for 42 years from 1968 to 2009.Mega-drought and pluvial events were influenced by climate forcing and internal variability of sea surface temperatures(SST).The decadal SST modes in the Pacific and Atlantic Oceans and their phase combinations were key factors regulating the megadrought and pluvial events in the Qilian Mountains.Solar radiation exhibited an in-phase vari-ation with the precipitation in the Qilian Mountains,while volcanic activity primarily affected megadrought events.This study highlights the importance of a long-term perspective for assessing current hydroclimate anoma-lies in the Qilian Mountains and including possible roles of external forcing and sea surface temperature variabili-ty in assessing the future megadrought and pluvial risks in this region.关键词
年代际旱涝/小冰期/气候驱动因素/祁连山Key words
megadrought/pluvial events/Little Ice Age/driving factors/Qilian Mountain引用本文复制引用
任子健,王江林,徐贺年,秦春..祁连山地区过去500 a年代际旱涝事件演化及驱动因素分析[J].干旱区地理,2024,47(2):214-227,14.基金项目
国家自然科学基金(41977383,42271175) （41977383,42271175）
甘肃省科技计划项目(23JRRA599)资助 （23JRRA599）
